/* roulang page: index */
:root {
      --primary-green: #2E7D32;
      --deep-green: #1B5E20;
      --warm-charcoal: #3E3A39;
      --vibrant-orange: #F57C00;
      --orange-hover: #E65100;
      --bg-warm-white: #FAFAF6;
      --bg-light-gray-green: #EEF2EB;
      --card-white: #FFFFFF;
      --border-light: rgba(46, 125, 50, 0.12);
      --shadow-sm: 0 2px 12px rgba(46, 125, 50, 0.08);
      --shadow-hover: 0 8px 24px rgba(46, 125, 50, 0.15);
      --text-primary: #2C2C2C;
      --text-secondary: #4A4A4A;
      --text-muted: #6B6B6B;
      --radius-lg: 12px;
      --radius-md: 8px;
      --transition: 0.3s ease;
      --container-max: 1280px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg-warm-white);
      color: var(--text-primary);
      line-height: 1.6;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background-color: #FFFFFF;
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }
    
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: var(--deep-green);
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 0.5px;
    }
    
    .logo svg {
      width: 36px;
      height: 36px;
    }
    
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    
    .nav-menu a {
      text-decoration: none;
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }
    
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary-green);
      border-bottom-color: var(--primary-green);
    }
    
    .btn-cta-nav {
      background-color: var(--vibrant-orange);
      color: white;
      border: none;
      padding: 10px 22px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 0.9rem;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
    }
    
    .btn-cta-nav:hover {
      background-color: var(--orange-hover);
    }
    
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--warm-charcoal);
      cursor: pointer;
    }
    
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--bg-warm-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.08);
        transform: translateY(-120%);
        opacity: 0;
        transition: transform 0.3s ease, opacity 0.3s ease;
        pointer-events: none;
      }
      .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }
      .hamburger {
        display: block;
      }
      .btn-cta-nav.desktop-only {
        display: none;
      }
    }
    
    @media (min-width: 769px) {
      .hamburger {
        display: none;
      }
    }
    
    /* 板块通用 */
    section {
      padding: 90px 0;
      scroll-margin-top: 72px;
    }
    
    h2 {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--warm-charcoal);
      letter-spacing: 0.5px;
    }
    
    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 48px;
      max-width: 700px;
    }
    
    /* Hero */
    .hero {
      padding: 120px 0 100px;
      background: linear-gradient(135deg, #FAFAF6 0%, #EEF2EB 100%);
    }
    
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      color: var(--deep-green);
      line-height: 1.3;
      margin-bottom: 20px;
    }
    
    .hero-content .subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: var(--vibrant-orange);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
    }
    
    .btn-primary:hover {
      background: var(--orange-hover);
    }
    
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary-green);
      color: var(--primary-green);
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
    }
    
    .btn-secondary:hover {
      background: rgba(46,125,50,0.08);
    }
    
    .hero-image img {
      width: 100%;
      border-radius: 24px;
      box-shadow: var(--shadow-sm);
      aspect-ratio: 4/3;
      object-fit: cover;
    }
    
    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 32px;
    }
    
    .stat-card {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      border-left: 6px solid var(--primary-green);
      transition: var(--transition);
    }
    
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    .stat-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--warm-charcoal);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    .stat-label {
      color: var(--text-muted);
      font-size: 0.95rem;
      margin-top: 8px;
    }
    
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    
    .service-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 20px;
      border-radius: 12px;
      background: #EEF2EB;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-green);
      font-size: 1.5rem;
    }
    
    .service-card h3 {
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 12px;
    }
    
    .service-desc {
      color: var(--text-secondary);
      margin-bottom: 20px;
      flex: 1;
    }
    
    .text-link {
      color: var(--primary-green);
      text-decoration: none;
      font-weight: 600;
      transition: var(--transition);
    }
    
    .text-link:hover {
      text-decoration: underline;
    }
    
    /* 对比 */
    .compare-wrapper {
      background: var(--bg-light-gray-green);
      border-radius: var(--radius-lg);
      padding: 48px;
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 24px;
      align-items: center;
    }
    
    .compare-col {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px;
    }
    
    .compare-col h3 {
      font-size: 1.6rem;
      margin-bottom: 24px;
    }
    
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 1rem;
    }
    
    .vs-badge {
      font-size: 2rem;
      font-weight: 800;
      color: var(--vibrant-orange);
      background: white;
      border-radius: 50%;
      width: 64px;
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-sm);
    }
    
    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .case-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border-left: 6px solid var(--vibrant-orange);
      transition: var(--transition);
    }
    
    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    
    .case-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    
    .case-content {
      padding: 20px;
    }
    
    .case-content h4 {
      font-weight: 700;
      margin-bottom: 8px;
    }
    
    .case-stat {
      color: var(--primary-green);
      font-weight: 700;
      margin-top: 12px;
    }
    
    /* FAQ */
    .faq-group {
      margin-bottom: 32px;
    }
    
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
    }
    
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1.05rem;
      color: var(--text-primary);
      transition: var(--transition);
    }
    
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-secondary);
      display: none;
    }
    
    .faq-item.active .faq-answer {
      display: block;
    }
    
    .faq-item.active .faq-question {
      color: var(--primary-green);
    }
    
    /* CTA */
    .cta-section {
      background: #EEF2EB;
    }
    
    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    
    .contact-form input,
    .contact-form textarea {
      width: 100%;
      padding: 14px;
      margin-bottom: 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      font-family: inherit;
      background: white;
    }
    
    .trust-logos {
      display: flex;
      gap: 24px;
      margin-top: 24px;
      align-items: center;
      flex-wrap: wrap;
    }
    
    /* 页脚 */
    .site-footer {
      background: var(--warm-charcoal);
      color: #E0E0E0;
      padding: 60px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    
    .footer-bottom {
      border-top: 1px solid #5A5554;
      padding-top: 24px;
      text-align: center;
      font-size: 0.9rem;
    }
    
    @media (max-width: 1024px) {
      .hero-grid, .cta-grid, .compare-wrapper {
        grid-template-columns: 1fr;
      }
      .dashboard-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid, .cases-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    
    @media (max-width: 768px) {
      .hero-content h1 { font-size: 2rem; }
      .dashboard-grid, .services-grid, .cases-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }